Polyether Polymer Dispersant for Concrete Water Reduction
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Solution Overview
Problem
Polycarboxylic acid water-reducing agents face challenges with high air-entraining effects, poor compatibility during long-term storage, and limited adaptability in regions with high mud content, leading to issues with concrete strength and stability.
Innovation Solution
A polymer is synthesized through polycondensation of a polyether macromonomer, a monomer with phosphoric acid or sulfonic groups, and an aldehyde, creating a dispersant that enhances water-reducing efficiency, controls air content, and improves compatibility with cement particles, thereby increasing concrete strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a polycarboxylic acid water-reducing agent is used to improve water-reducing efficiency, then water-reducing rate increases, but air-entraining effect becomes too high which negatively impacts concrete strength
Solution Approach 1:
The invention changes the chemical structure parameters of the water-reducing agent by replacing part of the carboxylic acid groups with phosphoric acid groups or sulfonic acid groups. This structural modification alters the molecular properties to reduce air-entraining effect while maintaining water-reducing efficiency, thereby resolving the contradiction between water-reducing rate and concrete strength
Solution Approach 2:
The invention creates a composite molecular structure combining polyether chains with phosphoric acid or sulfonic acid functional groups. This composite structure integrates the water-reducing capability of polycarboxylic acid with the low air-entraining properties of phosphoric/sulfonic acid groups, achieving both high water-reducing rate and acceptable concrete strength
2Ease of operation
If a polycarboxylic acid water-reducing agent is used to achieve high water-reducing efficiency, then flowability improves, but compatibility during long-term storage deteriorates
Solution Approach 1:
The invention modifies the chemical composition parameters by introducing phosphoric acid groups or sulfonic acid groups with different electrochemical properties. These parameter changes reduce molecular aggregation and improve solution stability over time, maintaining both flowability and compatibility during long-term storage
3Productivity
If a polycarboxylic acid water-reducing agent is used to achieve high water-reducing efficiency, then water-reducing rate increases, but adaptability for clays with high mud content deteriorates
Solution Approach 1:
The invention changes the surface interaction parameters by replacing carboxylic acid groups with phosphoric acid or sulfonic acid groups that have different adsorption characteristics. These parameter changes reduce excessive adsorption on clay surfaces while maintaining effective water-reducing action, improving adaptability for clays with high mud content
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymer significantly increases the water-reducing rate, maintains slump-retaining properties, and enhances adaptability in high-mud environments, resulting in improved concrete strength at various ages and reduced air content, addressing the limitations of existing polycarboxylic acid water-reducing agents.
Implementation Method 1
A polymer is synthesized through polycondensation of a polyether macromonomer, a monomer with phosphoric acid or sulfonic groups, and an aldehyde
Implementation Method 2
The polymer significantly increases the water-reducing rate, maintains slump-retaining properties, and enhances adaptability in high-mud environments
Implementation Method 3
The polymer significantly increases the water-reducing rate, maintains slump-retaining properties, and enhances adaptability in high-mud environments, resulting in improved concrete strength at various ages and reduced air content
Data Source
AI summary
The present invention provides a method for preparing a polymer and a use of the polymer. The resulting polymer is used as a dispersant for an aqueous dispersion of a hydraulic binder and/or a latent hydraulic binder, such that water-reducing rate is improved, and suitable control of air content can be achieved, thereby improving the strength of concrete. The method for preparing a polymer includes polycondensation of a polyether macromonomer A of a specific structure, a monomer B and an aldehyde C to obtain the polymer. The monomer B is phenylsulfonic acid, p-/o-aminophenylsulfonic acid, p-/o-hydroxylbenzoic acid, p-/o-aminobenzoic acid, p-/o-hydroxylphenylsulfonic acid, or a phosphoric acid group or phosphorous acid group-containing monomer of a specific structure. A molar ratio of the polyether macromonomer A and the monomer B is 1 : (0.5 to 12).